User’s Manual INNOMAR Parametric Sub-Bottom Profilers / SESWIN 85
Innomar Technologie GmbH (2023-01) 85
The INNOMAR SBP will transmit a full burst as defined in the synchronisation window at all
conditions. If the number of pings per burst does not fit into the trigger interval, the next trigger
event will be discarded. This may cause a sudden drop in the effective ping rate, even if the
external ping rate changes slightly only!
If external trigger events are discarded due to high delay values or too many pings required per
burst, the trigger information “EXT” in the SESWIN status bar starts to flash yellow.
The next figure illustrates what happens, if there are too many pings set to fit in one external
trigger cycle.
The two pings fit into the external trigger
cycle.
Now the time between two external
trigger events is too short, to transmit two
pings in between. Therefore, every
second external trigger event is dis-
carded. How to calculate the maximum
number of pings is described in the next
subsection.
6.2.4 External Trigger with Delay and Ping Rate Increase
It is possible to combine both features as
shown in the figure.
In this case the delay is applied before the
burst starts. To avoid discarded trigger
events, the delay and the number of
pings specified have to fit between two
(external) trigger events, see above.
If external trigger events are discarded due to high delay values or too many pings required per
burst, the trigger information “EXT” in the SESWIN status bar starts to flash yellow.
The maximum number of pings
within one
burst (avoiding lost trigger events) is:
All values (trigger period, delay) are time values. Note the fixed delay of 1 ms. Only the integer
part of the calculated result is used (decimals cut off, not rounded).
6.2.5 External Trigger – What to keep in mind
The external trigger signal should be TTL or RS232 compatible pulses (max. ±15 V).
“Sync IN”
“Sync OUT”
“Sync OUT”
“Sync IN”
“Sync IN”
“Sync OUT”
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